Bromargyrite

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Poullaba vein, Huelgoat, Finistère, Brittany, France
© P L e Roch

Show Bromargyrite Photos (24)

Formula:

AgBr

System:

Isometric

Colour:

Yellowish, greenish ...

Hardness:

2½

Member of:

Chlorargyrite Group

Name:

In allusion to its composition, containing BROMine and the Greek for silver, ARGYros.

Chlorargyrite Group.

Classification of Bromargyrite

IMA status:

Approved

Strunz 8th edition ID:

3/A.02-60

Nickel-Strunz 10th (pending) edition ID:

3.AA.15

3 : HALIDES
A : Simple halides, without H₂O
A : M:X = 1:1, 2:3, 3:5, etc.

Dana 8th edition ID:

9.1.4.2

9 : NORMAL HALIDES
1 : AX

Hey's CIM Ref.:

8.3.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
3 : Halides of Ag

mindat.org URL:

http://www.mindat.org/min-783.html
Please feel free to link to this page.

Type Occurrence of Bromargyrite

Type Locality:

Plateros, Zacatecas, Mexico

Year of Discovery:

1859

Geological Setting of type material:

Oxidation zone of silver deposit.

Occurrences of Bromargyrite

Geological Setting:

In the oxidation zones of silver deposits, notably in arid regions

Physical Properties of Bromargyrite

Lustre:

Adamantine, Resinous, Waxy

Diaphaneity (Transparency):

Transparent, Translucent

Colour:

Yellowish, greenish brown, bright green

Streak:

White to yellowish white

Hardness (Mohs):

2½

Tenacity:

Sectile

Cleavage:

None Observed

Fracture:

Irregular/Uneven, Sub-Conchoidal

Density (measured):

6.474 g/cm³

Density (calculated):

6.477 g/cm³

Crystallography of Bromargyrite

Crystal System:

Isometric

Class (H-M):

m3m (4/m 3 2/m) - Hexoctahedral

Space Group:

Fm3m {F4/m 3 2/m}

Cell Parameters:

a = 5.7745Å

Unit Cell Volume:

V 192.55 Å³ (Calculated from Unit Cell)

Morphology:

Crystals cubic, with {111} and {011}, to 1 cm; in parallel or subparallel groups; commonly as crusts and coatings; also massive.

Twinning:

{111}, rare

Comment:

On synthetic material.

X-Ray Powder Diffraction:

d-spacing		Intensity
2.886		(100)
2.041		(55)
1.667		(16)
1.291		(14)
1.1787		(10)
3.33		(8)
1.444		(8)

Comments:

Recorded on synthetic material

Optical Data of Bromargyrite

Type:

Isotropic

RI values:

n = 2.253

Maximum Birefringence:

δ = 0.000 - Isotropic minerals have no birefringence

Surface Relief:

Very High

Type:

Isotropic

Comments:

Mechanically deformed crystals may be weakly birefringent with lamellar or undulose extinction

Chemical Properties of Bromargyrite

Formula:

AgBr

Essential elements:

Ag, Br

All elements listed in formula:

Ag, Br

Analytical Data:

(1) Chemical analysis of material from Rancho de San Onofre, Charcas, Mexico
(2) Theoretical values for Ag(Br,Cl) with Br:Cl = 1:1

       (1)      (2)

Ag   (57.56)  (65.16)
Cl            (10.71)
Br   (42.44)  (24.13)

sum  100.00   100.00 wt.-%

Common Impurities:

Cl,I

Relationship of Bromargyrite to other Species

Member of:

Chlorargyrite Group

Other Members of Group:

- +

AgCl

CuI

(Ag,Cu)I

CuCl

Common Associates:

Wulfenite	Wad	Silver	Pyromorphite	Malachite
Limonite	Jarosite	Iodargyrite	Chlorargyrite	Cerussite
Atacamite

3.AA.05

Marshite

CuI

3.AA.05

Miersite

(Ag,Cu)I

3.AA.05

Nantokite

CuCl

3.AA.05

UM1999-11:I:CuS

Cu(I,S)

3.AA.10

Iodargyrite

AgI

3.AA.10

Tocornalite

(Ag,Hg)I

3.AA.15

Chlorargyrite

AgCl

3.AA.20

Carobbiite

3.AA.20

Griceite

LiF

3.AA.20

Halite

NaCl

3.AA.20

Sylvite

KCl

3.AA.20

Villiaumite

NaF

3.AA.25

Salammoniac

3.AA.25

UM1998-03-Cl:Tl

TlCl

3.AA.25

Lafossaite

Tl(Cl,Br)

3.AA.30

Calomel

(Hg

)Cl

3.AA.30

Kuzminite

(Hg

)(Br,Cl)

3.AA.30

Moschelite

(Hg

3.AA.35

Neighborite

NaMgF

3.AA.40

Chlorocalcite

KCaCl

3.AA.45

Kolarite

PbTeCl

3.AA.50

Radhakrishnaite

PbTe

(Cl,S)

3.AA.55

Challacolloite

KPb

3.AA.60

Hephaistosite

TlPb

8.3.1

Chlorargyrite

AgCl

8.3.3

Bromian Chlorargyrite

Ag(Cl,Br)

8.3.4

Iodargyrite

AgI

8.3.5

Miersite

(Ag,Cu)I

Other Names for Bromargyrite

Synonyms:

Bromic Silver	Bromide of Silver	Bromite	Bromyrite	Chorobromite
Plata cornea amarilla melada	Plata verde

Other Languages:

French:	Bromure d'Argent
German:	Bromargyrit Bromit Bromsilber Bromspat Bromyrit
Russian:	Бромаргирит
Simplified Chinese:	溴银矿

Spanish:	Bromargyrita Bromita Bromyrita

Varieties:

Chlorian Bromargyrite

Iodian Bromargyrite

Mercuroan Bromargyrite

Other Information

Fluorescence in UV light:

None

Thermal Behaviour:

Melts at 434°.

Health Warning:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Industrial Uses:

Ore of silver.

References for Bromargyrite

Reference List:

- +

Rammelsberg (1860): 196.

von Lasaulx (1878) Jb. Min.: 621.

Lovissato (1898) Acc. Linc. Rend.: 7: 246.

Levi and Tabet (1934) Acc. Linc., Rend.: (6): 19: 723.

Mott and Gurney (1940), Electronic Proc. in Ionic Crystals, Oxford.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 11-15.

NBS Circ. (1955), 539, 4, 46-47.

American Mineralogist (1964), 49, 224.

Barclay, C. J. and Jones, J. B. (1971): The Broken Hill silver halides. J. Geol. Soc. Australia 18, 149-157.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 78.